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Thinset Layer Volume and Dry Material Budget

Estimate an ideal uniform thinset layer, user-specified wet density, dry fraction, bags and material cost.

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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

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Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

A 2 m by 2 m area with a 4 mm effective layer uses 0.016 m³. At the entered wet density 2000 kg/m³ and 50% dry fraction, this models 16 kg of dry material: one 20 kg bag costing 10, with no waste.

Volume = area × effective thickness; wet mass = volume × density × (1+waste); dry mass = wet mass × dry fraction; bags = ceil(dry mass/bag mass).

Worked example

Enter these known values and leave the other values blank.

Tile size
Enter measured effective thickness
advancedMode
Modify thinset specifications?
Length of the area
2 m
Width of the area
2 m
Thinset thickness
4 mm
Density of thinset
2000 kg/m³
Wastage
0 %
Dry material percentage
50 %
Weight per bag
20 kg
Cost per bag
10 USD /bag
Total area to be tiled
4 m²
Volume needed
0.016 m³
Weight of thinset needed
32 kg
Dry material weight
16 kg
Bags
1 bags
Total cost
10 USD

Assumptions and limitations

  • This is an ideal effective layer estimate. Preset effective thicknesses are approximate planning assumptions; tile size alone cannot establish installation thickness, trowel selection or manufacturer coverage. Use measured effective thickness and the product yield.
  • The default wet density and dry fraction are adjustable assumptions, not manufacturer specifications. Added waste is a percentage of net quantity.
  • Clear an unknown before solving backward. Currency controls represent the chosen denomination without exchange rates; prices must use the selected denominator units.
  • Whole package, board, roll or truss ceilings use exact decimal arithmetic. An amount just above a whole-number boundary needs the next whole unit; numeric display rounding does not lower the purchase count.

Common questions

What is included in this estimate?

This is an ideal effective layer estimate. Preset effective thicknesses are approximate planning assumptions; tile size alone cannot establish installation thickness, trowel selection or manufacturer coverage. Use measured effective thickness and the product yield.

References

Enforce the documented geometric domains and positive whole counts. Use exact decimal ceilings for whole material quantities; the captured mathjs ceiling snaps sufficiently near integers and can undercount immediately above a boundary. Bookify uses exact customary mass and volume definitions for density units, replacing rounded factors in the reference.

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